Electrophoretic Deposition of Aged and Charge Controlled Colloidal Copper Sulfide Nanoparticles

Colloidal nanoparticles (NPs) have been recently spotlighted as building blocks for various nanostructured devices. Their collective properties have been exhibited by arranging them on a substrate to form assembled NPs. In particular, electrophoretic deposition (EPD) is an emerging fabrication method for such nanostructured films. To maximize the benefits of this method, further studies are required to fully elucidate the key parameters that influence the NP deposition. Herein, two key parameters are examined, namely: (i) the aging of colloidal NPs and (ii) the charge formation by surface ligands. The aging of Cu2-xS NPs changes the charge states, thus leading to different NP deposition behaviors. The SEM images of NP films, dynamic light scattering, and zeta potential results demonstrated that the charge control and restoration of interparticle interactions for aged NPs were achieved via simple ligand engineering. The charge control of colloidal NPs was found to be more dominant than the influence of aging, which can alter the surface charges of the NPs. The present results thus reveal that the charge formation on the colloidal NPs, which depends on the surface ligands, is an important controllable parameter in EPD.

Detection and Maintenance of Optimum Dynamic Fluid Level in Oil Well

This article discusses automation of oil wells equipped with sucker–rod pump assemblies. The control method of such assembly is proposed where variation of dynamic fluid level is selected as controllable parameter, the appropriate information can be obtained by mathematic processing of wattmeter graph signal. Simulation results are presented which confirm operability and efficiency of the proposed method of detection and maintenance of optimum dynamic fluid level.

Stastical methods in studies on the status of nutrition of military personnel

The possibility of applying the nonparametric statistical methods to solve the tasks of investigating and appraising the index status of nutrition of military servicemen is considered. The experience to use in parallel several statistical algorithms for testing hypotheses is shown. An approach was worked out to test a sequence of hypotheses going one after another when testing the previous hypothesis influences the choice of subsequent hypothesis to test. This approach is formalized as a scheme to incrementally estimate the status of nutrition of military servicemen. The proposed model of status of nutrition exploration is used to obtain the quality and quantity digital estimation of the expected trend of a certain controllable parameter or a group of parameters of status of nutrition. It is established that among the considered indicators of the status of nutrition, the prevailing number of them has undergone a regular change in different periods of a prolonged sea voyage, depending on the balance of the main food components (proteins, fats and carbohydrates) with other nutrients and on the energy costs of the body of servicemen. The algorithm for studying the status of nutrition of servicemen with the use of nonparametric methods of statistical analysis made it possible to reveal a number of changes in metabolic processes occurring at the prenosological level and conditioned by the peculiarities of nutrition and the nature of military professional activity. On the basis of the research results obtained, requirements for the content of vitamins and minerals in the diet, as well as vitamin-mineral complexes, necessary for strengthening the body’s protective functions and preventing various diseases, can be formulated. Applying this model enlarges greatly the exploration possibilities when the methodical recommendations and normative documents to regulate the nutrition of military servicemen are developed.

Multilayered hybrid roving as a manufacturing concept of continuous fiber–reinforced thermoplastic materials

A new manufacturing concept named multilayered hybrid (MLH) roving was invented in the form of a fiber roving separated evenly into several sublayers by thermoplastic films, which is manufactured by the sequential processes of spreading, fixing, and folding. This concept is aimed to combine the variety in processing of commingled roving and the variety in material configuration of organic sheet. For the review on impregnation basics, the Kozeny–Carman equation was examined on the packed bed of fibers, not of particles, to check out the controllable parameter. Also, the newly derived spreading equation was prepared to prevent the current problem of center splitting during fiber spreading processes. The impregnation quality was practically verified by the bending test on the unbalanced (2/1) woven fabric made of polypropylene (PP) and glass fiber (GF) MLH roving, PP/GF45 vol.% (70 wt%), which had been impregnated by the continuous compression molding machine considering the conditions of mass production. The representative flexural properties were statistically determined with the characteristic behavior of stress–strain curve. The coefficient-of-variation values were in the moderate range of around 5%, except for the strength and strain in minor direction that can be explained by the waving of fibers due to the lack of applied tension during and before impregnation.

Example Analysis on Safety Monitoring of Breakwater Engineering

Setting some projects including surface subsidence, pore water pressure and deep horizontal displacement etc, tracking monitoring soil deformation during construction, and controlling reasonable loading rate are the guarantee of safety and stability of foundation and structure during the construction of south breakwater of industrial park. Monitoring result shows that subsidence and displacement meet the design requirement, with more than 85% of foundation consolidation degree and every controllable parameter index, which achieves stability, safety and informatization construction of breakwater engineering, and guides similar engineering effectively.